/**
 * jCalendar 0.5
 *
 * Some code based on jQuery Date Picker (http://kelvinluck.com/assets/jquery/datePicker/)
 *
 * Copyright (c) 2007 Theodore Serbinski (http://tedserbinski.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 */
jQuery.jcalendar = function() {
    var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
    var days = ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'];
    var navLinks = {
        p:'&nbsp;', 
        n:'&nbsp;', 
        t:'&nbsp;'
    };
    var useForFixture = false;
    var config;
    var _firstDayOfWeek;
    var _firstDate;
    var _lastDate;
    var _selectedDate;

    var _drawCalendar = function(dateIn, a, day, month, year) {
        var today = new Date();
        var d;

        if (dateIn == undefined) {
            // start from this month.
            d = new Date(today.getFullYear(), today.getMonth(), 1);
            year.val(today.getFullYear());
            month.val(today.getMonth()+1);
            day.val(today.getDate());
        }
        else {
            // start from the passed in date
            d = dateIn;
            d.setDate(1);
        }

        // check that date is within allowed limits
        if ((d.getMonth() < _firstDate.getMonth() && d.getFullYear() == _firstDate.getFullYear()) || d.getFullYear() < _firstDate.getFullYear()) {
            d = new Date(_firstDate.getFullYear(), _firstDate.getMonth(), 1);
        }
        else if ((d.getMonth() > _lastDate.getMonth() && d.getFullYear() == _lastDate.getFullYear()) || d.getFullYear() > _lastDate.getFullYear()) {
            d = new Date(_lastDate.getFullYear(), _lastDate.getMonth(), 1);
        }

        var firstMonth = true;
        var firstDate = _firstDate.getDate();

        // create prev and next links
        if (!(d.getMonth() == _firstDate.getMonth() && d.getFullYear() == _firstDate.getFullYear())) {
            // not in first display month so show a previous link
            firstMonth = false;
            var lastMonth = d.getMonth() == 0 ? new Date(d.getFullYear()-1, 11, 1) : new Date(d.getFullYear(), d.getMonth()-1, 1);
            var prevLink = jQuery('<a href="" class="link-prev"> '+ navLinks.p +'</a>').click(function() {
                jQuery.jcalendar.changeMonth(lastMonth, this, day, month, year);
                return false;
            });
        }

        var finalMonth = true;
        var lastDate = _lastDate.getDate();

        if (!(d.getMonth() == _lastDate.getMonth() && d.getFullYear() == _lastDate.getFullYear())) {
            // in the last month - no next link
            finalMonth = false;
            var nextMonth = new Date(d.getFullYear(), d.getMonth()+1, 1);
            var nextLink = jQuery('<a href="" class="link-next">'+ navLinks.n +' </a>').click(function() {
                jQuery.jcalendar.changeMonth(nextMonth, this, day, month, year);
                return false;
            });
        }

        var todayLink = jQuery('<a href="" class="link-today">'+ navLinks.t +'</a>').click(function() {
            day.val(today.getDate());
            jQuery.jcalendar.changeMonth(today, this, day, month, year);
			
            return false;
        });

        // update the year and month select boxes
        year.val(d.getFullYear());
        month.val(d.getMonth()+1);

        var headRow = jQuery("<tr></tr>");
        for (var i=_firstDayOfWeek; i<_firstDayOfWeek+7; i++) {
            var weekday = i%7;
            var wordday = days[weekday];
            headRow.append('<th scope="col" abbr="'+ wordday +'" title="'+ wordday +'" class="'+ (weekday == 0 || weekday == 6 ? 'weekend' : 'weekday') +'">'+ wordday +'</th>');
        }
        headRow = jQuery("<thead></thead>").append(headRow);

        var tBody = jQuery("<tbody></tbody>");
        var lastDay = (new Date(d.getFullYear(), d.getMonth()+1, 0)).getDate();
        var curDay = _firstDayOfWeek - d.getDay();
        if (curDay > 0) curDay -= 7;

        var todayDate = today.getDate();
        var thisMonth = d.getMonth() == today.getMonth() && d.getFullYear() == today.getFullYear();

        // render calendar
        do {
            var thisRow = jQuery("<tr></tr>");
            for (var i=0; i<7; i++) {
                var weekday = (_firstDayOfWeek + i) % 7;
                var atts = {
                    'class':(weekday == 0 || weekday == 6 ? 'weekend ' : 'weekday ')
                    };

                if (curDay < 0 || curDay >= lastDay) {
                    dayStr = ' ';
                }
                else if (firstMonth && curDay < firstDate-1) {
                    dayStr = curDay+1;
                    atts['class'] += 'inactive';
                }
                else if (finalMonth && curDay > lastDate-1) {
                    dayStr = curDay+1;
                    atts['class'] += 'inactive';
                }
                else {
                    d.setDate(curDay+1);

                    // attach a click handler to every day to select it if clicked
                    // we use the rel attribute to keep track of the day that is being clicked
                    dayStr = jQuery('<a href="" rel="'+ d +'">'+ (curDay+1) +'</a>').click(function(e) {
                        
                        if (_selectedDate) {
                            _selectedDate.removeClass('selected');
                        }
                        _selectedDate = jQuery(this);
                        _selectedDate.addClass('selected');
                        day.val(new Date(_selectedDate.attr('rel')).getDate());
                        if(useForFixture){
                            var selectedDate = new Date(_selectedDate.attr('rel'));
                            var y = selectedDate.getFullYear();
                            var m = selectedDate.getMonth() + 1;
                            if (m < 10)
                                m = "0" + m;
                            var d = selectedDate.getDate();
                            if (d < 10)
                                d = "0" + d;
                            var date = y + "-" + m + "-" + d;
                            var href = config.url + '/lich-thi-dau/chi-tiet/ngay/' + date;
                            if (config.lid)
                                href += '/lid/' + config.lid;
                            window.location.href = href;
                        }
                        return false;
                    });

                    // highlight the current selected day
                    if (day.val() == d.getDate()) {
                        _selectedDate = dayStr;
                        _selectedDate.addClass('selected');
                    }
                }

                if (thisMonth && curDay+1 == todayDate) {
                    atts['class'] += 'today';
                }
                thisRow.append(jQuery("<td></td>").attr(atts).append(dayStr));
                curDay++;
            }

            tBody.append(thisRow);
        } while (curDay < lastDay);

        jQuery('div.main_jcalendar').html('<table cellspacing="1"></table><div class="jcalendar-links"></div>');
        jQuery('div.main_jcalendar table').append(headRow, tBody);
        jQuery('div.main_jcalendar > div.jcalendar-links').append(prevLink, todayLink, nextLink);
    };

    return {
        show: function(a, day, month, year) {
            _firstDate = a._startDate;
            _lastDate = a._endDate;
            _firstDayOfWeek = a._firstDayOfWeek;

            // pass in the selected form date if one was set
            var selected;
            if (year.val() > 0 && month.val() > 0 && day.val() > 0) {
                selected = new Date(year.val(), month.val()-1, day.val());
            }
            else {
                selected = null;
            }
            _drawCalendar(selected, a, day, month, year);
        },
        changeMonth: function(d, e, day, month, year) {
            _drawCalendar(d, e, day, month, year);
        },
        /**
		* Function: setLanguageStrings
		*
		* Allows you to localise the calendar by passing in relevant text for the english strings in the plugin.
		*
		* Arguments:
		* days		-	Array, e.g. ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
		* months	-	Array, e.g. ['January', 'Febuary', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
		* navLinks	-	Object, e.g. {p:'Prev', n:'Next', c:'Close', b:'Choose date'}
		**/
        setLanguageStrings: function(aDays, aMonths, aNavLinks) {
            days = aDays;
            months = aMonths;
            navLinks = aNavLinks;
        },
        /**
		* Function: setDateWindow
		*
		* Used internally to set the start and end dates for a given date select
		*
		* Arguments:
		* i			-	The id of the INPUT element this date window is for
		* w			-	The date window - an object containing startDate and endDate properties
		*				e.g. {startDate:'24-11-1981', endDate:'25-12-2012}
		**/
        setDateWindow: function(i, w, year) {
            if (w == undefined) w = {};
            if (w.startDate == undefined) {
                // set the minimum browseable date equal to January of the min year in the select box
                // don't get the first option because that is an empty year

                // note we can't do this: year.find('option:eq(1)').val()
                // it doesn't work in 1.0 since find() is destructive
                // so we copy the object to a new var
                i._startDate = new Date($(year).find('option:eq(1)').val(), 0, 1);
            }
            else {
                dateParts = w.startDate.split('-');
                i._startDate = new Date(dateParts[2], Number(dateParts[1])-1, Number(dateParts[0]));
            }
            if (w.endDate == undefined) {
                // set the maximum browseable date equal to December of the max year in the select box

                // note we can't do this: year.find('option:last').val()
                // it doesn't work in 1.0 since find() is destructive
                // so we copy the object to a new var
                i._endDate = new Date($(year).find('option:last').val(), 11, 1);
            }
            else {
                dateParts = w.endDate.split('-');
                i._endDate = new Date(dateParts[2], Number(dateParts[1])-1, Number(dateParts[0]));
            }
            i._firstDayOfWeek = w.firstDayOfWeek == undefined ? 0 : w.firstDayOfWeek;
        },
        setUseForFixture: function(use){
            useForFixture = use;
        },
        setConfig: function(conf){
            config = conf;
        }
    };
}();

jQuery.fn.jcalendar = function(a) {
    this.each(function() {
        var day = $(this).find('select.jcalendar-select-day');
        var month = $(this).find('select.jcalendar-select-month');
        var year = $(this).find('select.jcalendar-select-year');
        $('div.jcalendar-selects').after('<div class="main_jcalendar"></div>');
        jQuery.jcalendar.setDateWindow(this, a, year);
        jQuery.jcalendar.show(this, day, month, year);

        day.change(function() {
            // only if a valid day is selected
            if (this.value > 0) {
                d = new Date(year.val(), month.val()-1, this.value);
                jQuery.jcalendar.changeMonth(d, a, day, month, year);
            }
        });

        month.change(function() {
            // only if a valid month is selected
            if (this.value > 0) {
                d = new Date(year.val(), this.value-1, 1);
                jQuery.jcalendar.changeMonth(d, a, day, month, year);
            }
        });

        year.change(function() {
            // only if a valid year is selected
            if (this.value > 0) {
                d = new Date(this.value, month.val()-1, 1);
                jQuery.jcalendar.changeMonth(d, a, day, month, year);
            }
        });

    });
    return this;
};